US President Barack Obama speaks during a campaign event at the Fox Theatre in Oakland, California, on July 23, 2012. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/GettyImages)

President Barack Obama speaks during a campaign event at the Fox Theatre in Oakland, Calif., on July 23, 2012. (credit: SAUL LOEB/AFP/GettyImages)

WASHINGTON (AP) — The Obama administration’s new plan to grant temporary work permits to many young, illegal immigrants who otherwise could be deported may cost the government more than $585 million and require hiring hundreds of new federal employees to process more than 1 million anticipated requests, according to internal documents obtained by The Associated Press.

The Homeland Security Department plans, marked “not for distribution,” describe steps that immigrants will need to take — including a $465 paperwork fee — and how the government will manage the program. Illegal immigrants can request permission to stay in the country under the plan by filing a document, “Request for Deferred Action for Childhood Arrivals,” and simultaneously apply for a work permit starting Aug. 15.

Under the new program, which President Barack Obama announced last month, eligible immigrants must have arrived in the U.S. before their 16th birthday, are 30 or younger, have been living here at least five years, are in school or graduated or served in the military. They also must not have a criminal record or otherwise pose a safety threat. They can apply to stay in the country and be granted a work permit for two years, but they would not be granted citizenship.

The internal government plans obtained by the AP provide the first estimates of costs, how many immigrants were expected to participate and how long it might take for them. It was not immediately clear whether or under which circumstances any immigrants would not be required to pay the $465 paperwork fee. The plans said there would be no waivers, but Homeland Security Secretary Janet Napolitano told Congress last week that the government would grant waivers “in very deserving cases.” She said details were still being worked out.

“We anticipate that this will be a fee-driven process,” Napolitano said.

A DHS official said Tuesday that the department is looking at various estimates of the volume of applications and potential costs.

Fee waivers could dramatically affect the government’s share of the cost. The plans said that, depending on how many applicants don’t pay, the government could lose between $19 million and $121 million. Republican critics pounced on that.

“By lowering the fee or waiving it altogether for illegal immigrants, those who play by the rules will face delays and large backlogs as attention is diverted to illegal immigrants,” said House Judiciary Committee Chairman Lamar Smith, R-Texas. “American taxpayers should not be forced to bail out illegal immigrants and President Obama’s fiscally irresponsible policies.”

U.S. Citizenship and Immigration Services estimated it could receive more than 1 million applications during the first year of the program, or more than 3,000 per day. It would cost the government between $467 million and $585 million to process applications in the first two years of the program, with revenues from fees paid by immigrants estimated at $484 million, according to the plans.

The government estimated that as many as 890,000 immigrants in the first year would be immediately eligible to avoid deportation. The remaining 151,000 immigrants would likely be rejected as ineligible.

The plans estimated that the Homeland Security Department could need to hire more than 1,400 full-time employees, as well as contractors, to process the applications. Salaries were included in the agency’s estimates of total program costs.

Once immigrants submit their applications, it could take between two and 10 days for the Homeland Security Department to scan and file it. It could take up to four weeks longer to make an appointment for immigrants to submit their fingerprints and take photographs. A subsequent background check could take six more weeks, then three more months for the government to make its final decision before a work permit would be issued.

Napolitano said new information about the program should be made available by Aug. 1. She has said immigrants would generally not be detained by immigration authorities while their application is pending.